| |
|
 |
|
 |
|
|
|
| |
|
|
xen-devel
RE: [Xen-devel] Shadow Page Tables in Xen
> Have you actually measured this? I think that the major cause of page
> faults and VM slowdown is -- rather than page faults on write access
> -- the fact that we blow the shadow pagetables away everytime we clean
> the dirty bitmap, and this requires a long operation to remove from
> top to bottom all reference counts and reconstructing later the shadow
> pagetables on the next memory accesses.
Yep, ideally we'd just walking all the shadow leaf PTE's to just remove write
access. I'd guess that this would be a much more worthwhile optimization than
trying to 'pre-fetch' write faults.
Ian
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel
|
|
|
| |
|
Home